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Modelling of closed space acousticsby the beam method
Ryšavý, Marek ; Orlovský, Kristián (referee) ; Trzos, Michal (advisor)
The bachelor thesis describes the modeling of room acoustics using the ray tracing method. The first chapter deals with a general description of the basic properties of acoustic environment (wave acoustics, statistical acoustics and geometric acoustics). Then are described methods of calculating geometrical acoustics (image-source method, ray-tracing method and beam-tracing method). In the second chapter of this work is described in detail ray tracing methods and algorithm for calculate room acoustic using this method.
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Simulation and analysis of the block cipher mode with statistical self-synchronization
Kopčan, Marek ; Zezula, Radek (referee) ; Burda, Karel (advisor)
There is a enormous rise in importance of cryptography. In age of hi-technologies, where information are the most valuable asset, is need to protect this value. But we need to transport information between us and keep information confidental. In this case we use special modes of block cipher because of defect in communication canal. Not all modes are able to deal with this problem. For this purpose, there are special modes. This work deal with self-synchronization modes of block cipher. It is protection of tranfered information in communication canal against different types of defects. We will exam two self-synchronization modes - OCFB (Optimized Cipher FeedBack) and SCFB (Statistical Cipher FeedBack). Both have their advantages and disadvantages. The goal of this work is to provide analyse of both modes and to create simulation model. This model should help with further research of self-synchronization modes.
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Optimization of four-bar mechanism geometry for the predescribed trajectory
Korytár, Lukáš ; Sova, Václav (referee) ; Grepl, Robert (advisor)
This thesis deals with the optimization of arm lengths of four-bar RRRR mechanism using matrix kinematics. It compares and describes the methods, which are available in MATLAB software environment for this purpose. Consequently, an optimization algorithm using fmincon function is designed for which Monte-Carlo algorithm performs the first estimates. Elementary requirements for the proposed algorithm are devised in order to accurately duplicate the predescribed trajectory.
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Semiclassical Monte-Carlo method in three particle scattering.
Trnka, Jiří ; Čížek, Martin (advisor) ; Houfek, Karel (referee)
The thesis discusses semiclassical Monte carlo method in three particle scattering. The basic procedure for calculating cross sections of reactions of a single atom with a diatomic molecule is summarized. For the purpose of testing the method, the cross sections of exchange reactions in system H2+H represented by Karplus Porter potential energy surface were calculated. The thesis also deals with chaotic behaviour of threeparticle scattering in a simple model system of coupled Morse potentials. The model system was expanded by incorporating the process of associative detachement, which was studied in combination with long chaotic trajectories. Powered by TCPDF (www.tcpdf.org)
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Modelling of closed space acousticsby the beam method
Ryšavý, Marek ; Orlovský, Kristián (referee) ; Trzos, Michal (advisor)
The bachelor thesis describes the modeling of room acoustics using the ray tracing method. The first chapter deals with a general description of the basic properties of acoustic environment (wave acoustics, statistical acoustics and geometric acoustics). Then are described methods of calculating geometrical acoustics (image-source method, ray-tracing method and beam-tracing method). In the second chapter of this work is described in detail ray tracing methods and algorithm for calculate room acoustic using this method.
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Simulation and analysis of the block cipher mode with statistical self-synchronization
Kopčan, Marek ; Zezula, Radek (referee) ; Burda, Karel (advisor)
There is a enormous rise in importance of cryptography. In age of hi-technologies, where information are the most valuable asset, is need to protect this value. But we need to transport information between us and keep information confidental. In this case we use special modes of block cipher because of defect in communication canal. Not all modes are able to deal with this problem. For this purpose, there are special modes. This work deal with self-synchronization modes of block cipher. It is protection of tranfered information in communication canal against different types of defects. We will exam two self-synchronization modes - OCFB (Optimized Cipher FeedBack) and SCFB (Statistical Cipher FeedBack). Both have their advantages and disadvantages. The goal of this work is to provide analyse of both modes and to create simulation model. This model should help with further research of self-synchronization modes.
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Optimization of four-bar mechanism geometry for the predescribed trajectory
Korytár, Lukáš ; Sova, Václav (referee) ; Grepl, Robert (advisor)
This thesis deals with the optimization of arm lengths of four-bar RRRR mechanism using matrix kinematics. It compares and describes the methods, which are available in MATLAB software environment for this purpose. Consequently, an optimization algorithm using fmincon function is designed for which Monte-Carlo algorithm performs the first estimates. Elementary requirements for the proposed algorithm are devised in order to accurately duplicate the predescribed trajectory.
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Chaotic time-series prediction
Dědič, Martin ; Tichý, Vladimír (advisor) ; Smrčka, Pavel (referee)
This thesis focuses on possibility of chaotic (specially economic) time-series prediction. Chaotic time-series are unpredictable in long-term due to their high sensitivity on initial conditions. Nevertheless, their behavior should be more or less predictable in short-term. Goal of this thesis is to show, how much and if any prediction, is possible by non-linear prediction method, and try to reveal or to reject presence of chaotic behavior in them. Work is split into three chapters. Chapter One briefly introduces chosen important concepts and methods from this area. In addition, to describe some prediction methods, there are outlined which indicators and methods are possible to use in order to find possibilities and boundaries of this prediction. Chapter Two is focused on modifications of FracLab software, which is used for create this prediction. Last chapter is experimental. Besides the description of examined time-series and methods, it includes discussion of results.
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